Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations

CELSIUS-WASA Collaboration; T. Skorodko; M. Bashkanov; H. Clement; E. Doroshkevich; O. Khakimova; F. Kren; A. Pricking; G. J. Wagner

Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations

CELSIUS-WASA Collaboration, T. Skorodko^*, M. Bashkanov, H. Clement, E. Doroshkevich, O. Khakimova, F. Kren, A. Pricking, G. J. Wagner

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The two-pion production in nucleon-nucleon collisions has been studied by exclusive and kinematically complete experiments from threshold up to T(p) = 1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential distributions for the pi(+)pi(-) and pi(0)pi(0) channels are dominated by Roper excitation and its decay into N sigma and Delta pi channels. At beam energies T(p) > 1.1 GeV the Delta Delta excitation governs the two-pion production process. In the pi(+)pi(+) channel evidence is found for the excitation of a higher-lying I=3/2 resonance, favorably the Delta(1600). The isovector fusion processes leading to the deuteron and to quasi-stable (2)He, respectively, exhibit no or only a modest ABC-effect, i.e. low-mass enhancement in the pi pi-invariant mass spectrum, and can be described by conventional t-channel Delta Delta excitation. On the other hand, the isoscalar fusion process to the deuteron exhibits a dramatic ABC-effect correlated with a narrow resonance-like energy dependence in the total cross section with a width of only 50 MeV and situated at a mass 90 MeV below the Delta Delta mass.

Original language	English
Title of host publication	HADRON 2009
Editors	Crede, P Eugenio, A Ostrovidov
Publisher	AMER INST PHYSICS
Pages	520-524
Number of pages	5
ISBN (Print)	978-0-7354-0807-4
Publication status	Published - 29 Aug 2010
Event	13th International Conference on Hadron Spectroscopy - Tallahassee Duration: 29 Nov 2009 → 4 Dec 2009

Publication series

Name	AIP Conference Proceedings
Publisher	AMER INST PHYSICS
Volume	1257
ISSN (Print)	0094-243X

Conference

Conference	13th International Conference on Hadron Spectroscopy
City	Tallahassee
Period	29/11/09 → 4/12/09

Keywords

Roper excitation
Delta Delta excitation
Delta(1600)
ABC effect and resonance
PROTON-PROTON COLLISIONS
DOUBLE-PION PRODUCTION
ROPER RESONANCE
CROSS-SECTIONS
GEV-C
NUCLEON COLLISIONS
MESON PRODUCTION
ABC ENHANCEMENT
NEAR-THRESHOLD
S-WAVE

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https://arxiv.org/abs/1001.5446

Cite this

CELSIUS-WASA Collaboration, Skorodko, T., Bashkanov, M., Clement, H., Doroshkevich, E., Khakimova, O., Kren, F., Pricking, A., & Wagner, G. J. (2010). Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations. In Crede, P. Eugenio, & A. Ostrovidov (Eds.), HADRON 2009 (pp. 520-524). (AIP Conference Proceedings; Vol. 1257). AMER INST PHYSICS. https://arxiv.org/abs/1001.5446

CELSIUS-WASA Collaboration ; Skorodko, T. ; Bashkanov, M. ; Clement, H. ; Doroshkevich, E. ; Khakimova, O. ; Kren, F. ; Pricking, A. ; Wagner, G. J. / Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations. HADRON 2009. editor / Crede ; P Eugenio ; A Ostrovidov. AMER INST PHYSICS, 2010. pp. 520-524 (AIP Conference Proceedings).

@inproceedings{b3c1d52cfd68418b813ab3efa699d251,

title = "Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations",

abstract = "The two-pion production in nucleon-nucleon collisions has been studied by exclusive and kinematically complete experiments from threshold up to T(p) = 1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential distributions for the pi(+)pi(-) and pi(0)pi(0) channels are dominated by Roper excitation and its decay into N sigma and Delta pi channels. At beam energies T(p) > 1.1 GeV the Delta Delta excitation governs the two-pion production process. In the pi(+)pi(+) channel evidence is found for the excitation of a higher-lying I=3/2 resonance, favorably the Delta(1600). The isovector fusion processes leading to the deuteron and to quasi-stable (2)He, respectively, exhibit no or only a modest ABC-effect, i.e. low-mass enhancement in the pi pi-invariant mass spectrum, and can be described by conventional t-channel Delta Delta excitation. On the other hand, the isoscalar fusion process to the deuteron exhibits a dramatic ABC-effect correlated with a narrow resonance-like energy dependence in the total cross section with a width of only 50 MeV and situated at a mass 90 MeV below the Delta Delta mass.",

keywords = "Roper excitation, Delta Delta excitation, Delta(1600), ABC effect and resonance, PROTON-PROTON COLLISIONS, DOUBLE-PION PRODUCTION, ROPER RESONANCE, CROSS-SECTIONS, GEV-C, NUCLEON COLLISIONS, MESON PRODUCTION, ABC ENHANCEMENT, NEAR-THRESHOLD, S-WAVE",

author = "{CELSIUS-WASA Collaboration} and T. Skorodko and M. Bashkanov and H. Clement and E. Doroshkevich and O. Khakimova and F. Kren and A. Pricking and Wagner, {G. J.}",

year = "2010",

month = aug,

day = "29",

language = "English",

isbn = "978-0-7354-0807-4",

series = "AIP Conference Proceedings",

publisher = "AMER INST PHYSICS",

pages = "520--524",

editor = "Crede and P Eugenio and A Ostrovidov",

booktitle = "HADRON 2009",

note = "13th International Conference on Hadron Spectroscopy ; Conference date: 29-11-2009 Through 04-12-2009",

}

CELSIUS-WASA Collaboration, Skorodko, T, Bashkanov, M, Clement, H, Doroshkevich, E, Khakimova, O, Kren, F, Pricking, A & Wagner, GJ 2010, Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations. in Crede, P Eugenio & A Ostrovidov (eds), HADRON 2009. AIP Conference Proceedings, vol. 1257, AMER INST PHYSICS, pp. 520-524, 13th International Conference on Hadron Spectroscopy, Tallahassee, 29/11/09. <https://arxiv.org/abs/1001.5446>

Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations. / CELSIUS-WASA Collaboration; Skorodko, T.; Bashkanov, M.; Clement, H.; Doroshkevich, E.; Khakimova, O.; Kren, F.; Pricking, A.; Wagner, G. J.

HADRON 2009. ed. / Crede; P Eugenio; A Ostrovidov. AMER INST PHYSICS, 2010. p. 520-524 (AIP Conference Proceedings; Vol. 1257).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations

AU - CELSIUS-WASA Collaboration

AU - Skorodko, T.

AU - Bashkanov, M.

AU - Clement, H.

AU - Doroshkevich, E.

AU - Khakimova, O.

AU - Kren, F.

AU - Pricking, A.

AU - Wagner, G. J.

PY - 2010/8/29

Y1 - 2010/8/29

N2 - The two-pion production in nucleon-nucleon collisions has been studied by exclusive and kinematically complete experiments from threshold up to T(p) = 1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential distributions for the pi(+)pi(-) and pi(0)pi(0) channels are dominated by Roper excitation and its decay into N sigma and Delta pi channels. At beam energies T(p) > 1.1 GeV the Delta Delta excitation governs the two-pion production process. In the pi(+)pi(+) channel evidence is found for the excitation of a higher-lying I=3/2 resonance, favorably the Delta(1600). The isovector fusion processes leading to the deuteron and to quasi-stable (2)He, respectively, exhibit no or only a modest ABC-effect, i.e. low-mass enhancement in the pi pi-invariant mass spectrum, and can be described by conventional t-channel Delta Delta excitation. On the other hand, the isoscalar fusion process to the deuteron exhibits a dramatic ABC-effect correlated with a narrow resonance-like energy dependence in the total cross section with a width of only 50 MeV and situated at a mass 90 MeV below the Delta Delta mass.

AB - The two-pion production in nucleon-nucleon collisions has been studied by exclusive and kinematically complete experiments from threshold up to T(p) = 1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential distributions for the pi(+)pi(-) and pi(0)pi(0) channels are dominated by Roper excitation and its decay into N sigma and Delta pi channels. At beam energies T(p) > 1.1 GeV the Delta Delta excitation governs the two-pion production process. In the pi(+)pi(+) channel evidence is found for the excitation of a higher-lying I=3/2 resonance, favorably the Delta(1600). The isovector fusion processes leading to the deuteron and to quasi-stable (2)He, respectively, exhibit no or only a modest ABC-effect, i.e. low-mass enhancement in the pi pi-invariant mass spectrum, and can be described by conventional t-channel Delta Delta excitation. On the other hand, the isoscalar fusion process to the deuteron exhibits a dramatic ABC-effect correlated with a narrow resonance-like energy dependence in the total cross section with a width of only 50 MeV and situated at a mass 90 MeV below the Delta Delta mass.

KW - Roper excitation

KW - Delta Delta excitation

KW - Delta(1600)

KW - ABC effect and resonance

KW - PROTON-PROTON COLLISIONS

KW - DOUBLE-PION PRODUCTION

KW - ROPER RESONANCE

KW - CROSS-SECTIONS

KW - GEV-C

KW - NUCLEON COLLISIONS

KW - MESON PRODUCTION

KW - ABC ENHANCEMENT

KW - NEAR-THRESHOLD

KW - S-WAVE

M3 - Conference contribution

SN - 978-0-7354-0807-4

T3 - AIP Conference Proceedings

SP - 520

EP - 524

BT - HADRON 2009

A2 - Crede, null

A2 - Eugenio, P

A2 - Ostrovidov, A

PB - AMER INST PHYSICS

T2 - 13th International Conference on Hadron Spectroscopy

Y2 - 29 November 2009 through 4 December 2009

ER -

Systematic Study of Two-Pion Production in NN Collisions - from Single-Baryon to Di-Baryon Excitations

Abstract

Publication series

Conference

Keywords

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